Pulverizing-mill.



LEVI D. YORK, OF PORTSMOUTH, OHIO.

PULVERIZING-MILL.

Specification of Letters Patent.

Patented April 21, 1908.

Application filed May 13, 1907. Serial No. 373,328.

T 0 all whom it may concern:

Be it known'that I, LEVI D. YORK, a citizen of the United States, andresident of Portsmouth, in the county of Scioto and State of Ohio, haveinvented certain new and useful Improvements in Pulverizing-Mills, ofwhich the following is a s ecification.

The characteristlcsan advantages of the invention are hereinafter fullyset forth in connection with a detailed description of the accompanyingdrawing which illustrates. exemplifying structures in which theinvention is embodied, and in which Figure 1 is a plan View of aulverizing mill, Fig. 2, a vertical section of Fig. 1, Fig. 3, anelevation, Fig. 4, a detail of the rotary member, Fig. 5, a screenboxes, and screen box.

The mill rests on a base 1, havin a central upwardly projecting cone 2.Thelower ulverizing ring 8 rests on the base surroun ing the cone. Threeuprights 4 converge near the top of the mill at 5, where a sphericalsocket is formed to receive a spherical bearing-member 6. The weighteddriver 7 ref erably consists of a heavy mass of meta and has anoperatively integral shaft 8 extending upward from it, passing throughbearingmember 6, with a sliding fit. Seated in the bottom of the driveris the upper ulverizing ring 9, and balls 10 of any suitalile number runbetween rings 3 and 9, supporting the driver and serving as the rollingcrushing members.

The base carries uprights 11 and between these uprights are removablysecured screen boxes 12 of a suitable number, each comprising solid topand outside plates 13 and a ig. 6 an elevation of a screen 14 of a meshsuitable to the work forwhich the mill is intended, forming the insidesurface of the box. The boxes are open at the bottom and communicatewith a circular chamber inclosed by housing 15, which rests on the base.

Driver 7 is provided with a plurality of spiral vanes extending frombottom to top of the outside surface. These vanes are curved, as bestseen in Fi 4, so that at the bottom they present a s arp an le to thevertical and at their tops are near y parallel with the axis of thedrlver. The angle and shape of the vanes may of coursebe varied to suitdifferent workin conditions.

In operation materia to be pulverized is fed into the hollow bore 17 ofshaft 8 and Ian view of one of the falls upon apex of cone 2, whichdirects it to ls, by which it is pulverized. The pulthe ba verized orpartially pulverized material thrown out from the crushin balls isscooped up by the vanes and elevated toward the top 0 the rotor and atthe same time thrown outwardly, forcibly against the screens, throughwhich the material which is roperly pulverized passes, theremainderropping' ack to be again subjected to the action of the balls. Thepulverized material falls through the bottoms of the boxes into theannular chamber formed by housing 15. A plate 18 rests on top ofuprights 11 surrounding shaftS, with more or less clearance, andserlilres to prevent dust from rising from the m1 a For advantageouslyremoving the pulver ized material fromthe mill I rovide a conveyer,which will now be described: A ring of L-shaped ange-iron 2O rests inthe chamber in housing 15 with its open sides facing down and inwardly.At suitable intervals the ring is provided with blades 21 extendinginward,

and the outer web of the ring is provided with perforations 22 engagedby t e teeth of a spur wheel 23 earned on shaft 24, which is revolublyjournaled in bearings carried by the base and one of the uprights 4..Shaft 25 carries at its upper end alarge pulley 26, which is driven by asmall pulley 27 on shaft 8 and 'a belt. The main shaft is driven bymeans of ulley 29 from any suitable source of ower. ile the'machine isin operation sha 't 24 is driven slowly from the main shaft and ring 20is rotated, causing blades 21, which come in contact with the pulverizedmaterial, to carry the material around within housing 15 to one or morechutes 30, from which it is delivered to suitable receptacles.

As special oints of advantage in my invention the fbllowing are to benoted-the vanes on driver 7 not only throw the ulverized materialoutward by centrifuga force, but elevate it so that it is thrown againstthe whole surface of the screen. The screen surface is very large, whichis made possible crushing process. The conveyer is an operativelyintegral part of the mill and provides means for continuously and easilyremoving the product.

Having described my invention, What I claim is:

1. In a pulverizing mill, the combination of a driver, a shaft therefor,an annular chamber into which pulverized material falls, an annularconveyer in the chamber, a pinion engaging the conveyer, a pinion shaft,pulleys on the driver and pinion shafts, and a belt connectin thepulleys.

2. In a pu verizmg mill, a cylindrical driver, a shaft extending fromthe top there of, the driver and shaft having a cylindrical bore, abase, pulverizing rings carried by the base and driver, balls runningbetween the rings and carrying the driver, spiral vanes running from topto bottom of the cylindrical surface of the driver and screenssurrounding the driver.

3. In a pulverizing mill, a cylindrical driver, a shaft extending fromthe top thereof, the driver and shaft having a cylindrical bore, a base,pulverizing rings carried by the base and driver, balls running betweenthe rings and carrying the driver, spiral vanes running from top tobottom of the cylindrical surface of the driver, screens surrounding thedriver, a sleeve on the shaft forming a sliding fit and having aspherical member, and a stationary support having an internal sphericalsurface engaging the spherical member.

LEVI D. YORK. Witnesses B. L. LINDSEY, EDW. FEAZEL.

